<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .top{
            background: red;
            width: 100%;
            height: 100%;
            float: right;
        }
        .right{
            background: yellow;
            width: 80%;
            height: 200px;
            float: right;
        }
        .left{
            background: green;
            width: 20%;
            height: 200px;
            float: left;
        }
        .bottom{
            background: red;
            clear: both;
        }
    </style>
</head>
<body>
<div class="top">导航条</div>
<div class="right">展示区域</div>
<div class="left">功能列表</div>
<div class="bottom">底部区域</div>
</body>
</html>